dom4j解析xml，自己用的

最新推荐文章于 2025-03-20 20:27:11 发布

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最新推荐文章于 2025-03-20 20:27:11 发布

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分类专栏： java 文章标签： xml string null exception reference

本文链接：https://blog.youkuaiyun.com/fengspg/article/details/7358975

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本文介绍了一个Java程序，该程序使用DOM4J库解析XML文件，并将数据映射到自定义的JavaBean对象中。程序读取XML文件，提取文档类型、引用属性和其他属性，包括单值和多值属性。

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package com.spg.readXml;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import com.spg.bean.DocFile;
import com.spg.bean.DocFiles;

public class GetXml2DocFile {

	public static DocFiles getDocFiles(DocFiles docFiles) throws Exception{
		
		SAXReader read = new SAXReader();
		Document document = null;
		DocFile docFile = null;
		
		try {
			document = read.read(ClassLoader.getSystemResourceAsStream("documents.xml"));
			
			Element root = document.getRootElement();//units
			List<Element> unit = root.elements();
			//遍历unit
			for(Element e4unit : unit){
				// 取属性封装
				if(null != e4unit.attributeValue("type")){
					docFiles.setType(e4unit.attributeValue("type"));
				}else{
					throw new Exception("the type is null");
				}
				if(null != e4unit.attributeValue("reference")){
					docFiles.setIsReference(e4unit.attributeValue("reference"));
				}else{
					docFiles.setIsReference("N");
				}
				List<Element> attrList = e4unit.elements();
				String[] attrName = null;
				List<String> attrValue = new ArrayList<String>();
				Map<String[], String> docFilesSingleMap = new HashMap<String[], String>();
				Map<String[], String[]> docFilesRepeatMap = new HashMap<String[], String[]>();
				Map<String[], String> docFileSingleMap = null;
				Map<String[], String[]> docFileRepeatMap = null;
				List<DocFile> docFileList = new ArrayList<DocFile>();
				
				//unit下所有子元素
				for(Element e4attr : attrList){
					//非多值属性
					if(null == e4attr.attributeValue("isRepeating") || !e4attr.attributeValue("isRepeating").equalsIgnoreCase("Y")){
						attrName = new String[2];
						attrName[0] = e4attr.getName();
						if(e4attr.attributeValue("type") != null){
							attrName[1] = e4attr.attributeValue("type");
						}else{
							attrName[1] = "String";
						}
						docFilesSingleMap.put(attrName, e4attr.getTextTrim());
//						docFiles.setSingleAttrs(singleMap);
					}else{//多值属性情况
						attrName = new String[2];
						attrName[0] = e4attr.getName();
						if(e4attr.attributeValue("type") != null){
							attrName[1] = e4attr.attributeValue("type");
						}else{
							attrName[1] = "String";
						}
						List<Element> values = e4attr.elements();
						StringBuilder sb = new StringBuilder();
						for(Element value : values){
							sb.append(value.getTextTrim()+";");
						}
						attrValue = null;
						docFilesRepeatMap.put(attrName, sb.toString().split(";"));
//						docFiles.setRepeatAttrs(docFilesRepeatMap);
					}
					//封装docFile
					if(e4attr.getName().equals("documents")){
						List<Element> documents = e4attr.elements();
						docFileSingleMap = new HashMap<String[], String>();
						docFileRepeatMap = new HashMap<String[], String[]>();
						for(Element e4document : documents){
							docFile = new DocFile();
							//设置属性
							if(e4document.attributeValue("name") != null){
								docFile.setName(e4document.attributeValue("name"));
							}
							if(e4document.attributeValue("type") != null){
								docFile.setType(e4document.attributeValue("type"));
							}
							//非多值属性
							if(null == e4attr.attributeValue("isRepeating") || !e4document.attributeValue("isRepeating").equalsIgnoreCase("Y")){
								attrName = new String[2];
								attrName[0] = e4document.getName();
								if(e4document.attributeValue("type") != null){
									attrName[1] = e4document.attributeValue("type");
								}else{
									attrName[1] = "String";
								}
								docFileSingleMap.put(attrName, e4document.getTextTrim());
//								docFile.setSingleAttrs(docFileSingleMap);
							}else{//多值属性情况
								attrName = new String[2];
								attrName[0] = e4document.getName();
								if(e4document.attributeValue("type") != null){
									attrName[1] = e4document.attributeValue("type");
								}else{
									attrName[1] = "String";
								}
								List<Element> values = e4document.elements();
								StringBuilder sb = new StringBuilder();
								for(Element value : values){
									sb.append(value.getTextTrim()+";");
								}
								attrValue = null;
								docFileRepeatMap.put(attrName, sb.toString().split(";"));
//								docFile.setRepeatAttrs(docFileRepeatMap);
							}
							docFileList.add(docFile);
							docFiles.setDocFile(docFileList);
						}
						docFile.setSingleAttrs(docFileSingleMap);
						docFile.setRepeatAttrs(docFileRepeatMap);
					}
				}
				docFiles.setSingleAttrs(docFilesSingleMap);
				docFiles.setRepeatAttrs(docFilesRepeatMap);
			}
			
		} catch (DocumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} 
		return docFiles;
	}
	
}